98 



K. HONDA. 



TABLE IX. 



Here 1! denotes 



L 



■F{1), and its vakie was calculated from the 



experimental curve for the ordinary change of length. A glance 

 in the above table shows a fair agreement between the calculated 

 and the experimental values. The difference between these num- 

 bers is not of a serious nature, if we remember that one scale 

 division of the micrometer ocular corresponds to the change of 

 5.12x10"^ for nickel, and that the correction for temperature 

 amounts to 11 x 10"' in the most siguilicant case. 



The discrepancy is probably due to the residual effect and 

 also to the œolotropy of the tube. If the tube, after it is 

 magnetized both longitudinally and circularly, is demagnetized 

 by reversals with regard to the longitudinal magnetization, 

 the circular field remaining constant, as was actually the case 

 in the present experiment, the elongation due to the circular 

 field alone is usually increased by one or two scale divisions, 



